Just a couple of days ago we shared stories from across the web suggesting ARM is supposedly developing 128-bit mobile processors for the future. It turns out, this intel was wholly inaccurate as ARM themselves have come forward and categorically denied this. Here's a quote with the details,
Did you hear the joke about the 128 bit processor? Let me offer some factual corrections to an article which appeared a couple of days ago in the Korea Herald and which has fueled speculation…
This is an incredibly exciting time for the ARM ecosystem, with leading solutions from ARM partners taking computing to the next level. Over the past month, beginning at the ARM TechCon event in Santa Clara and continuing worldwide at our ARM Technical Symposia, we have publicly presented the future of ARM technologies to over 7000 engineers and counting. Those engineers have seen the facts:
ARM leads the way with our 32-bit CPUs supporting a range of power and performance points, including solutions using our big.LITTLE technology. These will be in about 10 billion chips sold in 2013 and will continue to grow for a very long time into the future.
ARM has launched a family of ARMv8-A architecture based processors that support 64-bit, and the first products based on these chips are coming to market.
In the coming year I expect we will see increasing announcements of 64-bit solutions across mobile, networking and server markets.
News reports have suggested that ARM is developing 128-bit processor technology: this is not true. 64-bit processors are capable of supporting the needs of the computing industry now and for many years to come. There are absolutely no plans underway for 128 bit ARM-based chips because they simply aren’t needed. Rumors to the contrary are simply incorrect.
Furthermore, comments attributed to any ARM executive including my colleague Antonio Viana that allegedly discuss any specific partner’s chip plans for the future or 128 bit development are inaccurate: no such comments have been made.
The ARM partnership is built around diversity of solutions, and ARM works diligently to assure our partners can announce their products at a time of their choosing, and showing their unique technical differentiation and value add. As a result, we absolutely do not disclose our partners product plans but defer to partners to make their own statements. The result is a vibrant marketplace of innovative solutions that serve a range of end application needs, which I find incredibly exciting.
That's a pretty strong denial. If you think about it, this really makes perfect sense. At least for the next several decades or so, it makes zero sense to have a 128-bit processor for a mobile device. The primary reason to move from a 32-bit processor to a 64-bit processor is to be able to access more than 3GB of RAM at one time. A 64-bit processor can actually access 16 Exabytes of RAM. To put that in perspective, that is the equivalent of 17,179,869,184 Gigabytes! It is unlikely we would need more RAM than that in a mobile device in this or the next generation.
Because of this reality, a 64-bit processor will likely be the flavor of all microprocessors for quite some time.
Source: ARM